What is the SQL syntax for executing a stored procedure in Interbase?

GET_ALL_NAMES this has no input parameters, but returns two columns, several rows
GET_SELECTED_NAME this has one varchar input parametes, returns two columns, zero, one or several rows, depending on the input value

I have spent a few hours searching for this, in vain.
I use ASP.Net, and know how to do this using command objects and the like, that is not the problem.

What I want is a *PURE* SQL syntax for calling stored procedures and getting results returned.

SUPER!!
The reason I gave this so many points is that I have hunted high and low for the answer, which for some reason is not easy to find, at least not for me.

BTW, the forst example,
select first_name, lastname from GET_ALL_NAMES ()
does not work here, this works:
select first_name, lastname from GET_ALL_NAMES
the parentheses gives an "unknown token" exception. Any comments?

FTR, I use the latest Firebird, and use the new generic DB components in ASP.Net 2.0

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